Any Follow Focus device used on FS100 warning - in general

plasticam

plasticam

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I've seen some discussion of mounts that have loosened up and after observing my own
FF unit - it is very clear that if you are using a FF with an FS100 be careful.

If you have Duclosed gears or gears that are fixed directly to barrel there is much less concern.
With gears that have spokes to enlarge the diameter and some sort of nut that stops the rotation from
being 360- watch out.

Two things here. First and worst. When the lock down nut revolves around and reaches the end of rotation
it comes up against a hard stop but if you put any further force on it from that point you are using geared
mechnical force directly against the 4 small screws that hold the mount to the camera chassis. You can see
the entire lens moving trying to chevy the lens right out of it's seat. Just be really careful as this is a consumer
built camera not made for the mechnical strengths surrounding pro gears. These things were made for little rubber
bushings and servo motors. FF unit were designed for Panavision, Mitchell, Arri- ever take one of those apart?
They are like a watchmaker decided to make a tank.

Lastly, when attaching/coupling the gears of the FF to the teeth of the lens- keep it as loose as you can.
Remember that when you lock the gear against the teeth any lateral force you create is transferred back to
the mount.

Just a heads up from a shooter who has seen the insides of plasticams- and not on purpose!
It's a great computer jammed into plastic junk.
 
Precisely why all mount adapters must be properly supported! As Caleb pointed out the (4) 1.5mm screws offer no defense against professional shooting environments. Even our Canon and Nikon mounts are double supported and are compatible with the double mount support. If the weight of the lens does not break something, regular lens changes, follow focus actions, etc....E-mounts and micro 4/3 have no useable strength for work we do as pros. It needs help. Whatever mount or lens is in use, being careful is only the beginning.
 
If I do buy a Scarlet, it will now be the Titanium EOS edition because of that. If I do buy a C300, I'll be careful.

I own an FS100, and don't use follow-focus, and this has been VERY educational. It sounds like something out of Dickens - 14 Year olds shouldn't go into an adult bare knuckle fight as their teeth will get loosened.

Thanks all, with a nod to those whose mounts are a little looser than they should be.
 
thats why this could be very useful/helpful for people who do used FFs and large lenses

attachment.php
 
Thanks Caleb, I would like to see your handle on top. ;-) I will send you the hole pattern on top, maybe you can take a look or we could make a plate to interface with you handle?

Availability is about 2 weeks. Pricing is now on our store, making kits as I write this so you can break it up into only the functions you want.
 
That photo shows the PL version. We are making Nikon and Canon as well. The Canon EF system has electronic control for iris.
 
eheath said:
thats why this could be very useful/helpful for people who do used FFs and large lenses

attachment.php
Click to expand...

Sorry, but I don't see why this very expensive mount will be useful "for prevent lens movement with follow-focusing" - with short lenses it doesn't matter, but with long lenses the focusing ring is so far away from lens mount, so strong, or not so strong mount will make no difference.. ( ..if I remember physics :) ) - this is why new long Cinema Canon lenses have SUPPORT on middle part of it:


Canon_FK14.4-60-CinemaLens.jpg
Canon_FK30-300-CinemaLens.jpg


So.. when I start to use my simple $25 adapter from Amazon, and notice LENS MOVEMENT, I found this TRIPOD COLLAR for Canon 70-200mm/2.8 L IS very usefull :


Lilliput_Gargantua_11.jpg



On this picture ( where I try 70-200/2.8 WITH Canon X1.4 Extender ) you can see how far from Lens mount it's located .. almost on the MIDDLE between focal plane and Focusing ring !! ...

SonyFS100_011.jpg


--------------------------------------
..and I would reccomend to use THE SAME tripod collar with Canon 24-70mm F2.8 lens ! It's work !! :)

Lens_mount.jpg



for my Sigma 50mm F1.4 Lens, I use Kipon adapter with built-in Aperture:

Kipon_EOS-NEX_Adapter_01.jpg


and it's strong enough for so short lens ... and APERTURE work absolutely PERFECT!! I was able to change the brigntess from maximum to complete darkness .. and it's work the SAME way on ANY lenses with F1.2 - F 1.4 and F1.8 aperture - I was testing all of them in B&H... BUT ((!!) with lenses F2.8 - it's ONLY VIGNETTING .. so APERTURE in this adapter usefull ONLY WITH FAST LENSES!!

( Actually with Sony FS-100 we have to use only VERY FAST lenses.. or we never will be able to get "film-look-Like" images with it ... )

so.. the only lens I don't make a support yet is my Canon 16-35 / 2.8 L II .. but I don't see a need to use FF with it .. :)
 
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SergeSmArt said:
Sorry, but I don't see why this very expensive mount will be useful "for prevent lens movement with follow-focusing" - with short lenses it doesn't matter, but with long lenses the focusing ring is so far away from lens mount, so strong, or not so strong mount will make no difference.. ( ..if I remember physics :) ) - this is why new long Cinema Canon lenses have SUPPORT on middle part of it:


Canon_FK14.4-60-CinemaLens.jpg
Canon_FK30-300-CinemaLens.jpg
Click to expand...

obviously if you're using a $47K lens, you'll have a rod support system. The support system i posted would be good for prime lenses and other still photo lenses, obviously a longer lens like the 70-200 would still need support but thats a given.
 
SergeSmArt said:
Sorry, but I don't see why this very expensive mount will be useful "for prevent lens movement with follow-focusing" - with short lenses it doesn't matter, but with long lenses the focusing ring is so far away from lens mount, so strong, or not so strong mount will make no difference.. ( ..if I remember physics :) )
Click to expand...

Well you have very nice lenses bro, but your memory of physics fails you!

Of course the longer the distance (force arm), the more difference a rigid mount like this will make. Will it suffice on its own, without a lens support? - Certainly not in the case of very long lenses. Is it still important? Yes!

BTW it makes me lough when I look at Sony's engineering with the FS 100: lot's of sturdy, large mount points (on the bottom, top and even side of the body), and just 4 tiny screws to hold the lens mount... What were they thinking?!!!
 
I'm looking at your photo showing a long "v" section of angle iron that serves (seemingly) as a shim under the lens and
the arm for your tv set. what would happen if someone accidentally bumped that arm? it appears that it would rip the lens
right off the cam.

Clearly just a prototype, but if I'm seeing this right - what are you thinking with this design?
 
Lets not confuse basic physics. Length creates leverage. Thats why it's easier to remove a nut with what we call in New England a "cheater" - a length of pipe slipped over the wrench handle. The longer the wrench handle - the more force can be generated.
(I know it always comes back to the "handle" with me ;)

The longer the lens the more potential there is to pop your lens mount out like a twist off beer.
 
moldcad said:
BTW it makes me laugh when I look at Sony's engineering with the FS 100: lot's of sturdy, large mount points (on the bottom, top and even side of the body), and just 4 tiny screws to hold the lens mount... What were they thinking?!!!
Click to expand...

AFAIK stills lens mounts are designed to break

This might seem crazy but its called 'fail soft design'

The concept being that the lens mount is a simple repair using a cheap part.. easily changable with three screws

If a lens were mounted to hard to the chassis the camera could be written off by an impact (twisted chassis = loss of lens to film plane accuracy)

Is that design approach suited to the rigours of film making.. not really IMO

Is it suited to use when taking still with an AF lens .. absolutely .. and that is what the E-mount is designed for

S
 
plasticam said:
I'm looking at your photo showing a long "v" section of angle iron that serves (seemingly) as a shim under the lens and
the arm for your tv set. what would happen if someone accidentally bumped that arm? it appears that it would rip the lens
right off the cam.

Clearly just a prototype, but if I'm seeing this right - what are you thinking with this design?
Click to expand...
I was thinking that bolt and black bracket which CONNECT tripod collar and the "arm" TO RODS is strong enough to keep them together ...

....but ... if someone accidentally bumped that arm, my insurance company will rip him off :2vrolijk_08:
 
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